The truth is, there are a lot of betas out there. A lot of scrubs, noobs, losers, and general hapless punks. Playerunknown knows that, and he wants to give you hardcore gamers out there, you titans among men, the opportunity to play amongst yourselves in First-person only servers for Playerunknown's Battlegrounds.
This update, courtesy of Playerunknown himself, seems to be motivated by those hardcore sick-ass gamers out there, who need their milsims (Military Simulations) to be as absolutely realistic as a game where you can accidentally walk through walls can be.
This is one of many recent updates PUBG has made, adding a zombie mode earlier this Summer, and consistently adding patches to the game. It's likely caused the delay of the game's release, but, honestly who cares I am loving every second of it (and most of the community doesn't seem to mind too much either). The update, as most PUBG updates do, should come towards the end of the month.
And, in all fairness, this update is going to allow people to play a game the way they want it to be played. There are obvious advantages to third-person combat that, when removed, can make for a more exhilarating, difficult experience to excite players. No reason to tease people for enjoying a different style of playing a game we all love.
But seriously if you can't even get a kill with a S686 while camping in an attic don't talk to me.